Question

5
A two digit number is formed with digits 2, 3, 5, 7, 9 without repetition.
What is the probability that the number formed is
(i) an odd number ?
(ii) a multiple of 5 ?


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Answer 1

Answer:

Giving Answer -

Digits are {22,23,25,27,29,32,33,35,37,39,52,53,55,57,59,72,73,75,77,79,92,93,95,97,99}

∴Total digits are 25

Odd numbers are 20

∴ probability that an odd number is formed is

$\frac{20}{25} = \frac{4}{5}$

a multiple of 5

Numbers which are multiple of 5 are

{25,35,55,75,95}

∴ probability of multiple of 5 is

$\frac{5}{25} = \frac{1}{5}$

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Answer 2

Answer:

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